Sewing-machine



No. 620,729. Patented Mar. 7, I899. J. E. BERTBAND.

SEWING MACHINE SHUTTLE.

(Application filed June 8, 1898.)

(No Model.)

ilnrrn STATES rein.

Anni? SEWlNG -MACHINE SHUTTLE.

SPECIFICATION forming part of Letters Patent No. 820,729, dated Max:117, 1899.

Application filed June 8, 1898. Serial 1%. 682,929. (No model.)

To all whom it may concern:

of Massachusetts, have invented certain new and useful Improvements in Sewing-Machine Shuttles, of which the following, taken in connection with the'accompanying drawings, is a specification.

My inveution'relates t0. sewing-machine shuttles, and particularly to that class of such shuttles known as oscillating shuttles; and it consists in certain novel features of construction, arrangement, and combination of parts,which will be readily understood byreference to the description oi the accompanying drawings and to the claims hereto appended and in which my invention is clearly pointed out.

Figure 1 of the drawings is a front elevation of a shuttle, illustrating my invention with small portions cut in section. Fig. 2 is a rear elevation of the same. Fig. 3 is an edge view looking directly at the point of its hook or upward relative to Fig. 1. Fig. 4 is an edge view looking toward the right of Fig. 1; and Fig. 5 is a section on line a" a: on Fig. 1, looking upward or toward the top of said figure. I v

In the drawings, A is the main body of the shuttle, provided in its front face with the circular chamber a, in which is the stud a, formed integral with or set in said shuttlebody, and also having formed in one piece therewith the-main body of the book 6 and havingcut through it the opening 0, as shown. The stud a has mounted thereon the threadcarrying bobbin B, having between it and the back plate of the chamber a the coiled spring (2 and secured thereon by the plate e and the screwf in a well-known manner, asshown in Figs. 1 and 5. I

The body A has formed on its periphery the segmental lip g to lit a suitable guideway in th shuttle-raceway in the usual manner, and

alto has formed upon its rear, at about ninety degrees from the point of the shuttle-hook, the

convex or rounded shallow boss or projection h, the on tcr edge of which projects slightly beyond the periphery ofthe lip g, as shown in Figs. 1 and 2. The office of this convex boss is to increase the spread of the loop of thread held by the barb ofthe needle and through which the shuttle is passing just as the shut tle is completing its forward movement, and.

thus aid the discharge of the'thread from the barb of the needle when the thread is drawn down ,to set the stitch. 1

The hook I) has detachably secured to its Q rear side the extension-point b of hardened steel, the extreme point of which is in a plane at the rear of the rear face of the main body A of the shuttle and projects beyond theperiphery of the main body of the shuttle, as,

shown in Figs. 1, 2, 3, and a By-this-con st'ruction and arrangement of the shuttle: hook the point of said hook is adapted to intersect'the path of reciprocation of thencedle in close proximity to the point of'saidneedle when at the extremeof its upward and backward movement and enter, open, and pass through the loop oi thread held by the barb of the needle without the aid, of other loop-opener and without injury to the needle,

and said point may be replaced when injured or badly worn and the shuttle be rendered as eifective as when new without replacing the whole shuttle, which isa great advantage.

The wall of the chamber a has formed therein the perforation i, which opens into the opening 0 and througnw'hich the thread is delivered from the bobbin B. (See Fig. .1.) Within the opening'c is firmly secured by the screw j the tension-spring is, arranged to .press upon the bobbin-thread after it has" passed through the perforation i and between said perforation and the thread-guiding eye Z,-setin the plate 9 in the axial line of said shuttle, the perforation i, point of contact of the spring 70 upon the thread, and the eye Z being so arranged relative to eachother and to the outline of, the shuttle that when the shuttle has completed its forward movement and the stitch is to beset the shuttle-thread will draw in substantially a straight line from said spring through said eye without any night upon said eye, as shown by the dotted line m on Fig. 1.

The heel of the shuttle-body A has formed therein a cylindrical chamber n, in which are inserted the coiled spring 0 and the short plunger 0', having its outer end convex and pressed outward by said spring into contact with the shuttle-carrier, indicated by dotted lines at 0 in Fig. 1,) sai plunger 0' serving IOO w to prevent the loop of thread being entirely discharged from the shuttle until force is applied thereto to set the stitch, at which time said plunger readily yields to allow the passage of said thread when such force is applied thereto. This yielding plunger is of great advantage when used in coiigeration with the shuttle carrier, as above described, as are also the relative positions of the threaddelivering perforation i, the spring It, and the eye Z, whereby the shuttle-thread is drawn freely through said eye Without any bight or chafing thereon when the stitch is set.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. A shuttle constructed and arranged to move about its center, and provided witha bobbin-receiving chamber, a loop-engaging hook, the opening throngh the same, and the thread delivering perforation between said chamber and opening, in combination with a bobbin fitted to and i'evoluble in said bobbin-receiving chamber, and constructed and arranged to be filled-with thread to be unwound from its periphery; the spring 1010- rounded shallow boss on its rear face about ninety degrees from the point of the loop-engaging hook, the on ter edge of which projects beyond the periphery of the main body of the shnttle as and for the purpose specified.

In testimony whereof I. have signed my name to this specification, in the presence of two subscribing Witnesses, on this 6th day of June, A. D. 1898.

JOSEPH ELI BERTRAND.

Witnesses:

" N. G. LOMBARD,

E. II. TAVARY. 

